Having a compeer or peer; matched with an equal; paired with someone of similar status.
From compeer (noun) + -ed (past participle/adjectival suffix). This creates an adjective from the noun, used to describe something that has been paired with an equal.
Like many past participles used adjectivally, 'compeered' is rare because speakers prefer direct adjectives—saying 'they were equals' instead of 'they were compeered' feels more natural, showing how English continuously simplifies complex participles.
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